20.
1.1 CDN
And make sure your CSS is on the same domain
http://www.jonathanklein.net/2014/02/revisiting-cookieless-domain.html
Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 20

21.
1.1 CDN
Google Chrome will open two TCP connections to
the primary host, one for the page, and the second
"just in case"
Midwest.io / 2014-07-14 FE Performance: Beginner to Expert to Crazy Person 21